Адакиты И Адакитовые Расплавы: Составы Пород, Закалочных Стекол И Включений В Минералах, "Петрология"

We studied whole rocks compositions of the Baydara and Semkorok Mountains, which are located at the north-western part of Kumroch Ridge. Rocks are represented by Amf-Px basaltic andesites and andesites, and have microelements distribution typical for island-arc type of rocks. Some mineralogical and geochemical characteristics of the studied lavas of the Baydara Mt. (low concentrations of K2O, all REE, LILE, Th and U) and the Semkorok Mt. (low LREE concentrations) make them principally different from the rocks of the located nearby Late Pleistocene-Holocene Shiveluch volcanic massif. Isotopic K-Ar age of lavas (0.7 Ma for Baydara and 1.3 Ma for Semkorok) allow us to propose that their eruptions might be caused by the initial phase of the northern segment of the Pacific plate subduction. The Early Paleocene age (~62 Ma) of the Khapitsa series rocks, which compose north-western part of Kumroch Ridge, is confirmed for the first time by the isotopic-geological methods.

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Адакиты И Адакитовые Расплавы: Составы Пород, Закалочных Стекол И Включений В Минералах, "Петрология"

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The Volcanism Occurring during the Initial Phase of Formation of the Northern Subduction Segment in the Pacific Plate (Kamchatka Peninsula, Kumroch Range)

The Volcanism Occurring during the Initial Phase of Formation of the Northern Subduction Segment in the Pacific Plate (Kamchatka Peninsula, Kumroch Range)

Volcanism of the Initial Stage of Subduction of the Northern Part of the Pacific Plate (Kamchatka Peninsula, Kumroch Ridge)

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